Oscillating vacuum pump



B. G.-A. HARKNESS AND H. F. VOSSELER.

OSCILLATING VACUUM PUMP.

APPLICATION HLED MAR. 29. 1920.

1,427,533. Patented Aug. 29, 1922.

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Application filed March 29, 19556. Serial No. 369,713.

To all whom t may concern Be it known that ive, Bnnrimar Grenen Amun llginnririss and HEINRICH FRANZ lossnnnn, both citisens of the Dominion oil New Zealand, and residing `at Stratford, in the Provincial District of Taranaki, New Zealand, subjects oi the King of Great Britw ain and lreland, he Te invented nenv and use-` ul Improvements in an `Improved @scillating Vacuum Pump, oifivhich the following is a specification.

This invention relates to vacuum pumps and provides an improved construction thereof, which is also capable of being converted into a vacuum enginmwhen required..

According to the `inveintion the pump has a cylinder adapted to oscillate on trunnions, and a slidevalve With hinged flaps at the ends7 Working on a valve face on the cylinder.

The cylinder is caused to oscillatebelovv4 the valve by the operation of the piston rod, said valve being held against reciprocating motion by a rod pivoted to a liriture.

The interior of the slide valve is connect ed with a vacuum pipe line, either through a central port opening;v through the `valve face and a passage through the cylinder' Wall and a hollow trunnion or by means of a flexible connection.

A rear and a iront port opening` into the back end and the trent end of the cylinder respectively also open through the valve tace one at each side of the central port and are alternately `connected With or opened to the central port, or the interiorfoi the valve7 by the oscillation ot the cylinder.

ln order to cause a vacuum to be produced the crank shaft, is rotated in the opposite direction, to which a pump crank yshaft is usually rotated.

.As the pump piston travels its tirst strolre the cylinder becomes filled with rareied air, Which has to be compressed to atmospheric pressure be'lore it can be driven out.

The hinged llaps prevent the entrance ot air to the cylinder through the rear and front ports, on the exhaust side et the piston, thereby preventing the creation ot back pressure in the pump and making same easier to drive.

At the same time the hinging ci the flaps permits the latter to lift and allow the Specification of Letters stent.

Patented flug, 2Q, 1922..

exhaust pressure to escape on the necessary deeg-ree of compression being obtained.

By removing' the hinged flaps 'from the slide valve and causing` vacuum to act in the valve through the central port7 passage, and hollow trunnion, or through the 'flexible connection7 the cranlr shaft of the machine will rotate in the ordinary waj-,f and develop power as an ordinary engine.

rllhe invention will be further described in conjunction with the accompanying drawino; in Which1 Figure l is an elevation and.

lllignre 2 a plan View ot the pump, and

Figure 3 a sectional elevation of same.

Figure l is a cross section of the cylinder and the valve While y l Figures 5 and 6 are an enlarged longitudi nal section and a cross section respectively et the valve and a modified form.

T he pump cylinder l has trunnions 2 and of which trunnien 2 is hollow and communicates by :pneans ot the passage 4 in the cylinder Wall with the central port 5 openingr through the valve tace 6.

rllhe trunnions 2 and 3 rest in bearings i9, and the hollow trunnion 2 is adapted to be put' into communication with a vacuum pipe line connectedup to Where desired.

The rear port 7 and the front port in the valve tace 6, open into the rear and iront ends respectively or the cylinder l. A rear cover 9 and a iront cover 10 are fitted to the cylinder l` Within which is a piston 1l operated by the piston rod l2 passingthroufrh a stuffing box 13, and connected toa cranlr shaft carrying a `fly Wheel 20, said crank shaft being` mounted in bearings on the base plate 21 in the usual Way.

rllhe bearings 19 for trunnions 2, 3 are provided on pedestals le integral with the base plate 2L The hollow slide valve l5 is pivoted to one end oi the rod 16, the other end of which is pivoted to a fixed column or standard 22 preferably also on the hase plate 2l.. The interior i7 of the valve l'is always open to the port 5, the latter being adapted to be connected by said valve 15, alternately with the rear port 7 and the front port 8.

Hinged fiaps 18 are provided one at each end of the valve l5.

portion ot the cylinder, in

rl`he machine when used as a vacuum pump is driven by an internal combustion engine, or other suitable means, so that its cranlr shalt is rotated in a counter clock- Wise direction, .Figure 3.

The rotation ol' the crank shalt and tlj movementl olf the piston rod l2, canse th cylinder l to oscillate in the bearings 'i9 beneath the .falve l5, Which is held inst backwards and iorvvard movement by the rod lG, the flaps i8 preventing the entrance ci? air to the cylinder l through the ports 7, 8 but allowing exhaust pressure to escape through the latter.

ln Figures and G the central port 5 is dispensed with, and the connection from the pipe line is made direct to the valve 15 by means of a flexible connection 23.

By removing the flaps i8, and connect-- ing the machine up with vacuum creatisource through either the hollow trunnion 2, passage d and port 5, or the flexible connection 23, so that vacuum is caused to act continuously in the interior 17 ol the valve 15, the cranlr shaft is caused to ro# tate in the usual direction and develop power as a vacuum driven engine.

lWhat We do claim and desire to secure by Letters Patent of the United States is l. ln a pump, an oscillating cylinder provided with a valve seat, a piston reciprocally mounted in the cylinder, said cylinder having ports extending,` from the valve tace to the opposite extremities of the cylinder, a hollovv valve movable on said valve tace, and linlr pivotally connected at one end at a point removed from the axis oit m vement ot the cylinder and connected its opposite end with the valve whereby the latter is moved across the valve seat co-incident with the oscillation of the cylinder.

2. In a pump, an oscillating` cylinder provided with valve tace and ports extending` from the valve face to the opposite extremities of the cylinder', a piston reciprocally mounted in the cylinder, a valve movable over said valve face to alternately un* cover said ports, means for limiting the movement ot the valve With respect to the cylinder whereby, during oscillation of the latter, the ports are alternately uncovered, and pivoted flaps' carried by the valve arranged to cover the ports and adapted to be opened by the internal fluid pressure iu the extremities oi' the cylinder.

3. ln a pump, an oscillating cylinder provided with a valve face having ports extending from the valve tace to the opposite eX- tremities of the cylinder, a piston reciprocally mounted in the cylinder, a valve movable on said valve Yface to alternately un cover said ports, a connecting,- link pivotally connected with the valve at one end, and a relatively stationary member pivotally connected with the opposite end of the linlr at a point removed trom the axis of oscillatory movement oi? the cylinder whereby the ports are alternately uncovered co-inoident with oscillation oit the cylinders.

4t. ln a pump, an oscillating cylinder provided vith a valve 'tace and ports extending from the valve face to the opposite eX- tremities of the cylinder, a piston reciprocally mounted in the cylinder, a valve movable over the valve tace to alternately uncover the ports, a relatively stationary standard, and a linlz pivotally connected at one end with the standard at a point removedy 'from the airis of oscillation oi the cylinder and connected at its opposite eX- tremity with the valve whereby reciprocating movement is imparted to the latter the valve face co-incident With'oscillatory movement oit trie cylinder. A

a pump, a cylinder provided With Ytace having ports therein, a valve across the valve tace to alternately f the ports, and ilaps pivotally connected with the extremities of the valve movable across the valve tace and constitut.. ing pressure relievingvalves actuated by internal pressure in the cylinder.

ln testimony whereof We have signed our names to this specification in the presence oi? two Witnesses. y

BERTRAM GERGE All-(EN HARKNESS. HEINRICH FRANZ VOSSELER.

Witnesses CLAUDE H. WESTON, E. CANTELL.

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